Technical information
6/22
1SDC210033D0202
Instructions for resetting the circuit-breaker following release
tripping
Selection of the type of circuit-breaker resetting depends on design requirements and on service
conditions.
Resetting can take place following tripping of the following releases:
β overcurrent;
β undervoltage;
β shunt opening.
The following three possibilities are suggested (see diagrams below):
1. Only manual resetting
To be wired (by the customer): contact SO1, contact SY/1 and the auxiliary relay KO (only for
MOD).
Opening is prevented until the circuit-breaker is in the tripped position.
To reset the circuit-breaker it is necessary to activate the special lever on the front of the motor
until the circuit-breaker goes into the open position.
2. Electrical resetting making the operator responsible
To be wired (by the customer): contact SO1, SO2, contact SY/1 and the auxiliary relay KO (only
for MOD).
Opening is allows by means of contact S02, which must be placed in custody and can only be
used if the information the person in charge of the control station has received make it possible
to exclude tripping due to a short-circuit, or if the causes of the short-circuit have been removed.
3. Electrical resetting always allowed
To be wired (by the customer): contact SO1, SO2, contact SY/1 and the auxiliary relay KO (only
for MOD).
Opening is always allowed by means of contact S02.
NB: If the magnetic, thermomagnetic or electronic trip unit is present, it is necessary to ο¬nd the
causes which led to the circuit-breaker being in the tripped position so as to prevent reclosing under
short-circuit conditions. In all cases, manual resetting is always allowed.
Resetting instructions